Comments: I ran a 4 mile race right out of the box. Superb and better heel cushioning and overall flexibility. Runs a definite 1/2 size short so, for sure, size up with this model. Like the forefoot cushioning and it has a good lightweight feel overall. Not really a trail oriented shoe, but should be an excellent option for smoother dirt trails or on canal banks. Worked very well on the roads and the outsole should be an added durability plus..From: David, Tempe, AZ